EP 0298750 B1 19930915 - RADIO TELEPHONE SYSTEM
Title (en)
RADIO TELEPHONE SYSTEM
Publication
Application
Priority
JP 17332387 A 19870710
Abstract (en)
[origin: EP0298750A2] A radio telephone system comprises a base unit (1) electrically connected to a wire telephone line (3) and at least one radio telephone set (2) which can be connected to the base unit (1) through a radio communication line (5 to 14, 17 to 19, 21, 22, 28). a predetermined threshold value is normally set for the intensity of a received electric field generated in the radio communication line (5 to 14, 17 to 19, 21, 22, 28) so that, when the received electric field intensity does not reach the threshold value, for example when the radio telephone set (2) is separated by more than a predetermined distance from the base unit (1), the radio communication line (5 to 14, 17 to 19, 21, 22, 28) is automatically cut off. In the radio telephone system, the threshold value for the received electric field intensity can be arbitrarily modified by means of a suitable operating member disposed in the radio telephone set (2) to thereby increase the flexibility of the radio telephone system. The operating member can comprise, of course, an exclusive key switch (29), a push-button switch (29) or the like, or alternatively a dial key (26) or the like previously provided in the radio telephone set (2) may be commonly used also as the operating member.
IPC 1-7
IPC 8 full level
H04M 1/72508 (2021.01); H04M 1/00 (2006.01); H04M 7/04 (2006.01); H04W 84/10 (2009.01)
CPC (source: EP KR US)
H04M 1/72 (2013.01 - KR); H04M 1/72508 (2013.01 - EP US)
Designated contracting state (EPC)
DE GB SE
DOCDB simple family (publication)
EP 0298750 A2 19890111; EP 0298750 A3 19890906; EP 0298750 B1 19930915; AU 1884688 A 19890112; AU 608625 B2 19910411; DE 3884077 D1 19931021; DE 3884077 T2 19940310; JP H0716264 B2 19950222; JP S6416134 A 19890119; KR 890003170 A 19890413; KR 910004059 B1 19910622; US 4939766 A 19900703
DOCDB simple family (application)
EP 88306234 A 19880707; AU 1884688 A 19880708; DE 3884077 T 19880707; JP 17332387 A 19870710; KR 880008358 A 19880706; US 21668888 A 19880708